Automatic fire-alarm.



.No. 876,384. PATENTBD'JAKM, 1908.

s. MURRAY.

AUTQMATIG FIRE ALARM.

APPLIGATION FILED APR. 20. 1901.

WITNESSES uvwawvm. 2/ S aum d, Hurra ZM+7W A TTORN/i Y5 bendi SlilATliitl Specification of Letters ilmtent.

Application filed April 20 190? Serial No. 339332.

To all whom it concern:

Be it known that I, SAMUEL MURRAY, of I villag'e'of Dublin, in the Province oi Gnte-rio, Clennde, have invented certain new and useful Improvements in Automatic Fire- Alarms, of which the following is e specific-e hand by heat is adapted to make contact with an adjustable contact piece whereby an electrical circuit is completed and an alarm given.

Figure 1 is a plan view showing my device in connection with e diagrammatically rep resented electrical elarm circuit. Fig. 2 is a side elevation, portly broken away of the thermostat. Fig. 3 IS a perspective view of e portion of the compound metal band of the thermostat. v

In the drawings like letters of reference indicate corresponding parts in the different figures. I

A is an electrical circuit in which B e battery and C on electric bell.

The wires of the circuit are connected re spectively to the binding posts D and E on t e rosette F forming the base of the thermostet. The binding post E is in. electrienl. contact with the bi icket G, inwhich is fol crumeii a lever H. This lever is preferebl formed'e's a cam lover, I being the corn.

3 is e compound metal band fixed at one end to the stud K, suitably secured to the rosette F. This band is curved round, as shown, and its end has an opening therein through which the arm ofithe' ever H passes so that. a slidingaconnection is formed be tween the bend and.- thelaver. I consider this sliding connection referable as no streint is in any we p need.

of the meta land on enoe 0 hea On the binding post Dis pivoted at cmtact ample A notched" are Mis provitlecl near the free end of thearm into any one of the notches of which the contact arm er the influupon the free i I lo sprung thus eii'ordin; en. adjustment of the contact errn to en rrom the can; lover.

The operation. tin device is as follows2- Under the influence of en almorrnelrise of stat is located the compound bend tenets to straighten out, and this bending of the bend rocks the cam lever and presses can! against the contact erni ll 1115i thus cone plctee the circuit, causing; the to i find the corn lever .prefereiile it pro" (lUCGS a. rubbing contact with the arm, which rubbing action tends to proglnce a. better electrical connection t on e strei ht contact between two compel" tivel 1 surfaces, as the rubbing action tends o (lie lodge any small particles or inequalities connection. i do not, however-.1, desire to limit myself to the use of this ce-nilever. It will be seen thet by moving the contact arm the thermostat may be set teeny desired temperature. As Q-XJEYGIHE cold hes tendency to cause the bend. to "move the orient the lever itself into content with the conte t arm I provide a. stop N *e'l'iiiivh limits ti) possible movement of the lover towards ti .5 contact arm and thus prevents such tact occurring.

VVhet I claim as my invention 17 The com notion compound metal band fixed at one encl; eem snitch-i3? Piv otcd;.e lever erin eizter ing from the com and to which the other f "bond is connected; contact p the coin erlenterl to cc; 1, is rocked h the movement t by the heml' i e l i ich the c v tect when the latter-is .E ctr-lied ment of the lever arm by the compound nietei hens. under pivoted e n o; e move-- ling of the the action of 3. The combination of e. inetei locum} one end; a com suitehly pi oted; lever end to which onncctetl; tint i the other end. of the bend is er'm extending from the cam temperature at the spot Where the thernio e cont which would operete'to spoil the electrical gag 876,384

a .pivoted adjusting contact piece with I the lotto? moved by the bending of the which the. com is adapted to Contact at; a l metal Bond under the action of heat and a point between its pivot and its end when stop for preventing cont-act of the com with the iatter is moved by the bending of the the Contact pieoe under the action of ex- 15 metal band under the action of heat. trcme cold.

Dublin, Ont, 12th April, 1907.

SAMUEL MURRAY.

Signed in t-ho presence oi-- Jiisi CANNIIIG, JAMES KRANSKQPF.

4 The combination of metal band fixeu at one and; aqarn suitably piiotod; a lever arm extending from the cam and to which the other and of the band is connected; and 10 a pivoted adjusting cont-act piece with which the cam is adapted "to contact Wnen. 

